Hi @clayboy
I think this setting is missing in your dashboard.
I have alternate way for this.
In your dashboard
1)From the WordPress left menu, go to Appearance > Customize.
2)In customizer, from the left dashboard, click on WooCommerce > Product Images.
3)Change the value under the Thumbnail width to your desired width.
4)Select a desired option under the Thumbnail cropping to change the image aspect ratio.
5)Click on the Publish button.
after publishing you have regenerate thumbnails.
Thanks